Revolving drying oven



J ne 7, 1938. I I; E, P, Hus: I 2,119,915

' REVOLVI'NG DRYING OVEN Filed Jan. 4, 1957 2 Sheets-Sheet 1 z. fly;

INVENTOR: fyebg 'yi' 61159239,

' A TTORNEYS. t

Patented it... 7, 1938;

UNITED STATES REVOLVING DRYING OVEN Ingebrigt Elias Paulsen Huse, Haroy,near Molde, Norway In Norway January 4, 1936 Application January 4,1937, Serial No. 118,987

5 Claims.

My invention relates to improvements in revolving drying ovens, and moreparticularly such ovens as are used for the drying of all kinds of fishmeal or the like after it has been ground or pulverized in any of theapproved manners. The drying in such ovens is efiected by passing acurrent of gas through the mass to be dried, which gas may be hot air orthe like.

Different constructions of such ovens are known. The difficulty in allsuch ovens is to give the mass to be dried the necessary circulationwithin the oven, so that the drying gas intimately may contact everyparticle of the mass. In order to obtain this effect, revolving barrelshave been tried equipped witha gas conduit eccentric with respect to theaxis of rotation of the barrel, which gas conduit is equipped withlongitudinal ribs and holes, through whiclrlatter the drying gas isforced into the mass. This gas conduit is revolved in the same or thereverse direction as the barrel but with another speed and by therelative rotation of the barrel and the gas conduit, the mass to bedried is turned again and again at'the same time as the drying gas isflowing through it.

Such ovens have, however, not been satisfactory, as it is only theinterior of the mass which is turned and not the surface. As the masshas a. high percentage of fat and before the drying 0 also containslarge quantities of water, there are on the surface formed balls of themass and by the prior ovens it has been very diflicult to break up.these' balls and obtain an even drying throughout the mass. a When thedrying gas is passed through the mass it is of the greatest importancethat the gas shall meet the most even resistance throughout the mass,'as the gas will seek the easiest way through the mass and escape throughthe 9 shortest paths, doing no good to the other parts of the mass. Itis-therefore of the greatest importance that the mass be continuouslyturned so that the drying may be even throughout the for instance bytoothed wheels or any other approved manner. The barrel is preferablymounted to rotate on its own axis, in the direction of the arrow a inFig. 2.

The end walls of the barrel are stationarybut adjustable rotatively onsaid axis, and between them is fixed an eccentric gas chamber or conduitl3, into which gas is fed through a 'pipe ll through the end wall Ill.The gas isexhausted' through the opening l5 by a pumplfi, the openinghaving a filter or screen for preventing the mass from being drawn outof the barrel. The gas chamber I3 is eccentric to the axis of thebarrel. The side ll of the gas chamber l3 facing.

the interior of the barrel is built up of ilal'l'bylj straps or lowerslats of sheet iron I8 arran ed in an inclined plane, and a lowermostterminal I wall plate 20. Each slat overlaps the next'llowerlongitudinal openings or slots IS in thissid'e through which the dryinggas is fed. It willbe seen that this series of slats forms the majorportion of the inner side of the gas chamber l3 and making this side ofthe chamber l3 nearly flat, but that the lower part or wall 20 has adefinite curve downward from the lowermost slot I9. The other side 2| ofthe gas chamber I3 is concentricto the wall of the barrel and spaced ashort distance from same, forming a passage 23 between the two, as inFig. 2. It should, however, be -understood that it is not absolutelynecessary that this side of the gas chamber l3 be parallel to thewall ofthe barrel. but the best results will be obtained when so arranged. The

, inner side of the barrel is equipped with a numone, as shown on Fig.2, thereby forming narro'w' ber of longitudinal ribs 22 of suitable formfixed thereon at short intervals.

If so desired, this outer side of the gas chamber l3 may alsobe providedwith holes for the gas to pass through into the mass of stock beinglifted in the passage 23 between the wall of the chamber l3 and drum l2,but in the most cases this will be superfluous.

By the arrangement explained the greater part of the mass of stock inthe barrel (as shown upon Fig. 2) lies overthe inclined sideof the gaschamber 13 and during the revolving of the barrel in the direction ofthe arrow a constant flow of the stock is caused from the part of themass accumulated in the lower part of the barrel and by'the ribs carriedupward through the passage 23 to the outer side I! of the gas chamber B.The part of the mass lying on the inclined side of the gas chamber l3will constantly gravitate downward and by this constant circulation themass will be evenly treated by the drying gas.

The gas chamber l3 can be arranged so that it may be adjusted rotativelyfor difierent positions in the barrel, as shown upon Fig. 3', still.maintaining the passage 23 between its side 2i and the wall of thebarrel.

I have discovered that there may be a tendency of the mass to accumulatein the lower part of the barrel and here become so hard that it takesfire. In order to prevent this I have arranged an agitator 24, of anyconvenient profile or cross section, revolubly mounted and extendinglongitudinally through the lower part of the barrel near the plate 20,which agitator during the revolving of the barrel is kept constantlyrocking, thereby loosening the stock and overcoming any tendency of massto accumulate and harden in the bottom of the barrel.

During the circulation of the stock through the passage 23 the mass isnot only carried by the ribs, but also pulverized and turned, owing tothe friction against the side 2| of the chamber I3.

To the upper parts of the side walls I0 and II swinging hanger arms 26are pivoted as at 25, and on their lower ends a roller 28 of anysuitable profile is journalled, the pivots being so located that theroller rests by gravity on the stock passing downwardly over the innerside of the 0n the accompanying drawings I have only shown a schematicdiagram of my invention. It should, however, be understood that myinvention is not limited to this form only, but that any useful formwithin the scope of the invention may be chosen.

Having now particularly described and ascertained the nature of my saidinvention, I declare that what I claim is:

1. A drying oven consisting of a main drying chamber, a second chambertherewithin having one side disposed at such inclination that materialto be dried will slide thereon by gravity,

means to move material from below the lower part of the said inclinedside on to the upper side thereof said inclined side having louveredopenings therethrough, means to discharge heated gases through saidopenings, a roller extended horizontally adjacent said inclined side,hanger means therefor having a fixed pivotal axis above the secondchamber positioned so that the roller wll tend to swing by gravityagainst the said inclined side.

2. The structure of claim '1 in which the first named chamber is arevolving drum, and the second chamber is fixed therein.

3. In a revolving drying oven, a revolubly mounted cylinder havingcleats longitudinally therein, an elongated stationary chamber mountedeccentrically therein having an outer side concentric with the cylinderand an inner side inclined for stock to slide thereon by gravity, thelast named side being louvered for discharge of gas therethrough, meansto supply gas to the said chamber, means to rotate the cylinder, in adirection to engage and lift stock beside the outer side of saidchamber, and an agitator device consisting of a rigid member pivoted ateach end of the cylinder on an axis parallel to that of the cylinder andparallel to the said chamber, said agitator device being located closeto the lower side of the cylinder and to the lower part of the saidchamber, and means to operate the agitator device.

4. The structure of claim 3 in which said cham'-. her and said agitatorhave a mounting adjustable rotatively on the axis of the cylinder.

5. The structure of claim 3 in which a roller is provided intermediatelyof the height of said inclined side, hanger arms having. said roller iiirelation to the said chamber, and the said chamher and pivots of thearms being rotatively adjustable on the axis of the cylinder.

INGEBRIGT ELIAS PA ULSEN HUSE.

